Hepatotoxicity in acute iron poisoning

Area of Science:

• Toxicology
• Hepatology
• Clinical Medicine

Background:

• Liver injury is a known complication of acute iron poisoning, though detailed studies are scarce.
• Existing reports suggest a dose-dependent relationship between iron levels and liver damage.
• Variability in outcomes, with severe poisoning sometimes occurring without liver injury, necessitates further investigation.

Purpose of the Study:

• To investigate the dose-related hypothesis of iron poisoning-induced hepatotoxicity.
• To identify specific serum iron concentration thresholds associated with liver injury risk.
• To establish a clearer understanding of risk factors for severe outcomes in acute iron poisoning.

Main Methods:

• Retrospective review of 20 years of hospital data.
• Inclusion of patient demographics, ingestion details, and peak serum iron levels.
• Defined iron poisoning, hepatotoxicity, and severe hepatotoxicity based on established criteria (serum iron >300 microg/dL, transaminases >150 U/L, and >1000 U/L, respectively).

Main Results:

• Seventy-three patients were analyzed; 60 showed no hepatotoxicity with serum iron levels ranging from 300-704 microg/dL.
• Thirteen patients developed hepatotoxicity, with nine experiencing severe liver injury.
• Severe liver injury correlated with serum iron concentrations significantly exceeding 1000 microg/dL.

Conclusions:

• Hepatotoxicity from iron poisoning is a dose-dependent phenomenon.
• Clinically significant liver injury is improbable with serum iron levels below 700 microg/dL within 12 hours.
• Serum iron concentrations above 1000 microg/dL within 12 hours are associated with clinically important hepatotoxicity.